Re: [PATCH 09/13] sched: Add bandwidth management for sched_dl

[Peter Zijlstra]

Like this then? :-)

--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -5056,10 +5019,25 @@ static int sched_cpu_inactive(struct not
 	switch (action & ~CPU_TASKS_FROZEN) {
 	case CPU_DOWN_PREPARE:
 		set_cpu_active((long)hcpu, false);
+
+		/* explicitly allow suspend */
+		if (!(action & CPU_TASKS_FROZEN)) {
+			struct dl_bw *dl_b = dl_bw_of(cpu);
+			bool overflow;
+			int cpus;
+
+			raw_spin_lock_irqsave(&dl_b->lock, flags);
+			cpus = dl_bw_cpus(cpu);
+			overflow = __dl_overflow(dl_b, cpus, 0, 0);
+			raw_spin_unlock_irqrestore(&dl_b->lock, flags);
+
+			if (overflow)
+				return notifier_from_errno(-EBUSY);
+		}
 		return NOTIFY_OK;
-	default:
-		return NOTIFY_DONE;
 	}
+
+	return NOTIFY_DONE;
 }
 
 static int __init migration_init(void)
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/